Allocated memory escapes a reference to parameter variable

[Curtis]

I recently updated my compiler from 2.091.1 to 2.096.0. After 
doing so, I started getting deprecations that I think may be 
related to the DIP25 change mentioned in the release notes here: 
https://dlang.org/changelog/2.092.0.html#dip25.

Here's an example of the code that is generating the deprecation 
notices: https://run.dlang.io/is/MRFG1u

I found this issue that seems to be very similar to what I am 
running into: https://issues.dlang.org/show_bug.cgi?id=21525.

Can someone help me understand whether the deprecation notices 
are spurious (as in the issue above) and if not, what I need to 
do to fix the deprecations?

Thanks!